Dimension gauge



April 19, 1927. H. FRAUENTHAL DIMENSION GAUGE Fiied Sept.

' INVENTOR Harold Frauentha! BY 7 5 .1 7111A? ATTORNEY Patented Apr. 19,1927.

UNITED STATES 1. 25.4 2 PATENT oFFJcEIq HAROLD FRAUENTHAL, OF OIEVEILAND, OHIO.

DIMENSION GAUGE.

Application filed September- 24, 1926. Serial No. 137,491 i This invention relates to gauges, and more particularly to gauges. for testing and measuring apertures.

Frequently in the past, plug gauges have been employed to determine the accuracy of apertures such as in metal parts. Such plug gau'ges,however, determine only maximum and. minimum dimensions and tell nothing about the exact shape of an aper- 1U ture. Thus, out-of-roundness cannot be detected by the use'of plug gauges. d An object of this invention is to provide a gauge whereby dimensions-of parts may be readily and accurately determined.

1 15. A further'object of my invention is to provide a gauge for testing 'apertured parts whereby the exact shape and dimensions of said apertures may be quicklyand accurately determined.

Another object of this invention is to provide an indicating gauge with which out-. of-roundness in apertured parts may be readily detected, and the amount of such out-of-roundness measured.

In the drawings:

Figure 1 is a perspective view of. a form of gauge contemplated by my invention 1 Fig. 2 is a vertical section taken centrally through the gauge shown in Fig. 1; Fig.3 is a plan view on line 3'"3 of Fig. 2.with the dust cover removed;

Fig. 4 is a sectional view taken on line 4-4 of Fig.- 2;

Fig -5 is an enlargedplan view of the gauge members, with a piece to be tested disposed in cooperative relation therewith; an r Fig. 6 is an enlarged plan view similar to Fig. 5 showing gauge members of a modified form.

My" invention may be said to contemplate a gauge having a fixed, and a movable gauge member, said gauge members being normally spaced apartby resilient means,

and being adaptedtt'rfcooperate with the wall of an aperture to be measured. The gauge is preferably arranged so that the size of the aperture, as determined by the movement or position of the movable gauge member, is directly indicated by a suitable indicating means.

Thus there is shown in Fig. 1 a gauge hav-.

ing a fixed gauge member'l, and a second movable gauge member 2, normally s aced from the first gauge member 1 by suitable 'to be later more fully described, and as proresilient means. The movement or osition of the movable gauge member 2, an hence the size of an aperture to be measured i indicated on the dial of the indicator 3.

The gauge is provided with the base support 4 which is preferably heavy and which is shown .in the form of a hollow casting. Supported in fixed position on the support 4 is the fixed gauge member 1. The member 1 is shown as provided with extended portion 5 snugly disposed in a correspondingly shaped aperture in the base support 4. The upper portion 6 of the member 1, is shown as semi-cylindrical in shape for a purpose vided with a taperedmtop portion 7. Al modified form of. fixed gauge member is shown in Fig. 6 which will also be later described.

The upper portion of the base support 4 is shown as provided with a slideway 8. Disposed in said slideway and movable longitudinally thereof'toward and from said fixed gauge member 1 is a slide 9. Carried by the slide 9 is the second gauge member 2, having an extended portion 10, and a semi-cylindrical portion 11, and a top portion 12. When the gaugemembers 1 and- 2 are disposed adjacent to each other,'the

semi-cylindrical portions 6 and 11 thereof form a cylindrical portion.

-Disposed on each side of the slide 9 and parallel to the line of travel thereof are the transversely adjustable guide blocks 13 and 14. The guide blocks 13 and 14 may be secured to the base'suppor-t 4, by suitable means such as the screws 15. -Lateral ad justment oftheguide blocks 13 and 14 to prevent transverse movement of the slide. 9 maybe obtained by means of the adjusting screws 16, extending through the upstanding sides 17 of the slideway; J

In the adjacent cooperating portions of the guideblock's 13 and 4 and slide 9, are

the grooves 20, 21, 22 an 23, arranged to form a ball race to receive the frictionless bearings 24. The bearings 24 support the slide 9. in spaced relation to the,bottom of 5 the slideway 8, sd that the slide 9 may move longitudinally without substantial friction-,110 whereby gauge readings may not be renderedinaecujrate due to friction in moving parts. Retainers 25 and 26 are shown disposed between the grooves 20 and 21, and 22 and 23 respectively, to maintain the bear- 0 -the fixed member 1.

ings 24 in suitable spaced alignment. Adjacent the. lower portion of the sluleway S, is the clean-out aperture 27, and over the slide 9 and guide blocks 13 and 14., may be the slide 9, movable with said slide. and,

extending inwardly of the hollow base support a through the aperture 32, is a pin 33.

In the recess 34 disposed below the slideway 8, is shown a resilient spring: 35 adapted to be normally under compression to exert pressure against the wall 36 of the recess 34, and the suitably flattened portion 37 of the pin 38. By means of the spring 35 and the pin 38, the second gauge member 2 is normally yieldingly maintained in spaced relation to the fixed range member 1. Since the possible longitudinal movement of the slide 9 is preferably relatively small, substantially constant pressure is exerted by the spring 35 upon the pin 38 and upon pieces to be measured whereby uniform, consistent and accurate results are readily obtained.

The gauge member 2 may be moved to ward the fixed gauge member 1 by means of the cam member 40. 'Journaled transversely of the base support 4 is the rotatable shaft -11. The cam member 4-0 is mounted on the shaft 41. and locked against rotation there with as by the set screw 42. On one end of the shaft 41 is mounted the handle 43 by depressing which the shaft may be rotated. Referring particularly to Fig. 2, it will be understood that when the handle 43 is do pressed, the cam member will cooperate with the pin 38 to move the slide 9 and the second gauge member 2 toward the fixed gauge member 1.

Extending longitudinally from the upper end of the slide 9 is a pin 44: arranged to cooperate with the stem 45 of the indicator.

3. The stem 45 preferably normally exerts a slight pressure on the pin' 44, whereby movement of the gauge member 2 and slide 9 is indicated directly on the dial 47. If

desired, the pin 44 may be omitted and the stem 45 arranged to contact end of the slide 9.

The indicating mcans 3 is shown as pivotally afiixed to the boss 48 of the support 4, in order that for purposes of disassembly of the gauge, the indicator 3 may swung with the upper out of engagement with the pin 45, carrie by the slide 9.

To make internal measurements with my improved gauge, the handle 43 is depressed, moving the second gauge member 2 toward The piece 50 having an aperture 51 whose size and shape is to be determined is then disposed over the gauge members to the position shown for a particular diameter.

dotted lines in Fig. 2. The handle 43 is then released. It will be noted that the diameter of the semi-cylindrical gauge portions shown in the drawings is preferably smaller than that of the aperture to be 111035 ured. By this means substantially line conill tact may be obtained between the points of tangency of the gauge members 1 and 2 and the wall of the aperture 51, as indicated at 52 and 53 in Fig. 5. It will be understood. of course, that the gauge members 1 and 2 may also be made of such shape to give point contact with the wall of an aperture to be measured, as will be readily understood to those skilled in the art.

lVhen the handle 43 is released, it will be noted that the gauge member 2, due to the force exerted by the spring 35, tends to move away from the fixed gauge mem her 1, whereby the gauge members 1 and 2 exert a certain constant pressure upon the wall of the aperture 51 at the points of contact therewith. The diameter of the aperture 51 with the piece in the position shown in Fig. 2 will be shown on the dial 47. It will be understood that the dial may be previously calibrated with a suitable standard test piece to give a desired dial reading The piece 50 may be rotated about the gauge members 1 and 2, which, due to the force exerted by the spring 35, will remain in contact with the wall of an aperture, whereby the diameters of the aperture 5t will be continuously measured and continuously indicated on the dial 47. aperture may be readily and rapidly measured for size and ont-of-ronndness.

Thus it will be seen that the The aperture 51 in the piece 50 is shown llU is likely to be triangular, or polygonal in a multiple of three, such as due to the moth, od of forming the apertures. modified gauge inembers 60 and 61. shown in Fig. 6. may be employed. The movable gauge. member 61 is substantially similar to the movable gauge member 2 previously described, line contact with the wall of the aperture 62 taking place at the line of: tangency 63. The fixed gauge member 60 is shown as provided Witlr two cylindrical portions whereby line eontact'with the wall of the aperture 62 may take place at 66 and 67. The points It will be understood that my improved I fixed gauge member carried by said support, 'a slide movable on said support toward and away from said fixed gauge member frictionless bearings associated with said support, said slide being mounted in said frictionless bearings whereby the accurate measurement of an internal dimension will not be inhibited by friction between said slide and adjacent parts, and whereby the accuracy tures.

gauge may be employed for measuring any of the instrument may be retained, a second internal surfaces, and is not confined for gauge member carried by said slide, means use in measuring substantially circular aperexerting substantially uniform pressureand arranged to maintain said secondv gauge It will thus be seen that I have provided member in spaced relation tosaid fixed a new and r latively simple and sturdy auge member, said slide being adapted to gauge, having substantially frictionless movfie moved toward said fixed gauge member ing parts, for rapidly and accurately measwhereby the piece whose internal dimension uring internal dimensions. is to be measured may be readily disposed It will further be noted that I have proexternally of said gauge members, said slide vided a gauge giving uniform results wherebeing positioned in measuring position by by measurements may. be made which are said pressure exerted onsaid second gauge not only relative for one particular piece member, whereby said gauge members will. to be measured,;bnt comparative for i'eadcontact withvinternal portions of the piece in s taken from day to day. to be measured, and indicating means assot will also be seen that my gauge is ciated with and actuated by said slide, adapted for rapid production inspection of whereby said internal dimension will be diprecision parts such as employed in the rectly and accurately indicated on said indiautomotive industry. eating means.

Furthermore, it 1s to be understood that the particular forms of apparatus shown 'the accurate measurement of internal dimenand described, and the particular procedure sions, in combination, a base support, a fixed set forth, are presented for purposes of exgauge member carried by said support, a-

planation and illustration and that various slide movable 011 said support toward and modifications of said apparatus and proaway from said fixed gauge member, friccedure can be made without departing from tionless bearings associated with said supmy invention as defined in the. appended port,said slide being mounted in said fricclaims.

tiouless bearings whereby the accurate meas- VVhat I claim 1s:

urement of an internal dimension will not 1. In a gauge particularly adapted for the be inhibited by friction between said slide accurate measurement of internal dimenand adjacent parts, and whereby the acsions, in combination, abase support, a fixed curacy of the instrument may be retained, gauge member carried by said support, a adjustable'guide members arranged to preslide movable on said support toward and vent transverse movement of said slide. a away from said fixed gauge member, a secsecond gauge member carried by said slide, 0nd gauge member carried by said slide, means exerting substantially uniform presmea-ns exerting substantially uniform pressure and arranged to maintain said second sure and'arranged to maintain said second gauge, member in spaced relation to said gauge member 1n spaced relation to said fixed gauge member, said slide being adaptfixed gauge member, said slide being adapted to be moved toward said 'fixed gauge ed to be moved toward said fixed gauge member'whereby the piece whose internal member whereby the piece whose internal dimension is to be-measured may be readily dimension is to measured may be readily disposed externally of said gauge members,

disposed externally of said gauge members, said slidebeing positionedin measuring; po-

said slide being positioned in measuring sition by said pressure exerted on said secposition by said pressure exerted on said end gauge member, whereby said gaugesecond gauge member, whereby said gaugemembers will contact with internal portions members will contact with internal portions 05 the piece to be measured, and indicating of the piece to be measured, and indicating means associated with and actuated by said meansassoeiated withand actuated by said slide, whereby saidinternal dimension will slide, whereby said internal dimension will be directly andaccurately indicated on said be directly and accurately indicatedon said indicating means.

- indicating means.

4. In a gauge, in combination, a base sup- 2. In a gauge particularly adapted for port, a fixed gauge "member .carried by said the accurate measurement of internal disupport, there being a slideway on said supmensions, in combination, a base support, a port, frictionless bearings associated with said support, a slide mounted in said frictionless bearings and movable in said slidetoward said fixed gauge member, means for member, means for actuating said cam memactuating said cam member, and indicating means cooperatively associated with said slide and actuated directly by. movement thereof.

5. In a, gauge, in combination, a base support, a fixed gauge member carried by said support, there being a slideway on said support, frictionless bearings associated with said support, a slide mounted in said frictionless bearings and movable in said slideway toward and away from said fixed gauge member, adjustable guide members arranged to prevent transverse movement of said slide, a second gauge member carried by said slide and adapted to be disposed adjacent said fixed auge member, is. projecting portion carri by said slide and movable there with, resilient means arranged to cooperate with said projecting portion to yieldingly maintain said second gauge member in spaced relation to said fixed gauge member, a cam member arranged to cooperate with said projecting portion to move said second gauge member toward said fixed gauge 1,e25,4ea

her, and indicating means actuated directly by movement of said slide.

6. In a gauge, in combination, abase support, a fixed gauge member carried b said support and rovided with a semi-cy dri' cal portion, t lere being a slideway on said support, a slide movable in said slideway toward and away from said fixed gauge member, transversely adjustable gui e blocks secured to said base support and disposed on each side of said slide parallel to the line of travel thereof, there being grooves in the adjacent cooperating portions of said guide blocks and slide, frictionless bearin disposed in said grooves intermediate said guide blocks and slide, and supporting said slide in spaced relation to the bottom of said slideway, a second gauge member carried by said slide and provided with a semicylindrical portion adapted to cooperate with the corresponding portion of the fixed gauge member to form a c lindrical portion, a pm carried by said side and movable therewith, a spring arranged to coo rate with said pin to yieldingly maintain said second gauge member in spaced relation to said fixed gauge member, a transverse shaft jour; naled in said base support, a cam mounted on said shaft and arranged to cooperate with said pin to move said second uge member toward said fixed gauge mem r, a handle arranged to actuate said cam shaft and cam, and an indicator cooperatively associated with said slide and actuated by movement thereof.

In testimony whereof I alfix my signature.

HAROLD FRAUENTHAL. 

